Mobile HD4000 and HD4600 1920x1080 at 120hz

Mobile HD4000 and HD4600 1920x1080 at 120hz

I would like to know whether the Mobile IGPs in the Ivy (hd4000) and haswell(4600) are able to output 1920x1080 at 120hz via displayports(either 1.1a or 1.2)? So far I have only been able to find the maximum resolutions at 60hz; however, nothing on the 1920x1080 maximum hz.

I want to order a laptop and I need to be able to work with 120hz through an external monitor; however, the optimus or enduro technology sends the signal through the IGP and not the Nvidia or AMD cards.